After chlorine poisoning occurs, you should go to a well-ventilated place in time. If only a small amount of chlorine gas is inhaled and causes mild poisoning, it will not affect your health. If a larger amount is inhaled and the poisoning is severe and not treated promptly, it usually leads to death in about 1-2 hours. Chlorine gas is a toxic yellow-green gas that reacts with the water in the respiratory mucosa to form hypochlorous acid and hydrochloric acid after inhalation. Hypochlorous acid causes strong oxidation of tissues, while hydrochloric acid stimulates mucous membranes leading to inflammation and swelling, making the respiratory mucous membranes edematous and secreting large amounts of mucus, which can cause respiratory difficulties in the body. Therefore, the most obvious symptom of chlorine gas poisoning is severe coughing. If the symptoms are more severe, it can be complicated by the appearance of pulmonary edema, which makes breathing difficult and leads to death. If it enters through the esophagus, it can cause nausea, vomiting, chest pain, diarrhea and other symptoms. Therefore, after chlorine poisoning occurs, it is recommended to go to a regular hospital for treatment in a timely manner.